<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>正则表达式</title>
</head>
<body>
    <script>
          var str='abc123ABCjkj';
          var regExp=/[a-z]/gi;
         /* var regExp=/aBC/i;
          var regExp=new regExp('123','gi');
         console.log(regExp.exec(str));*/
         console.log(str.match(regExp));
    
    </script>
    
</body>
</html>
